中央新闻纪录电影制片厂 The fourth technology of fiber-optic communication systems made use of optical amplification to lessen the need to have for repeaters and wavelength-division multiplexing (WDM) to improve data ability. The introduction of WDM was the beginning of optical networking, as WDM became the technology of option for fiber-optic bandwidth expansion.[24] https://aikidohistory38260.bloggosite.com/40636897/top-services-secrets